DHT-Based Channel Estimation for MIMO-OFDM Systems

Discrete Fourier transform (DFT)-based least square (LS) channel estimation with phase shifted pilots (PSP) is a practical method in multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. In this paper, a real number pilot sequence is presented to replace PSP in time-domain LS channel estimation algorithm, which can reduce computation and save memory while keeping the precision. Furthermore, using discrete Hartley transform (DHT) in LS channel estimation algorithm, a simpler estimator is derived. The simulation results demonstrate the effectiveness of the proposed pilot sequence and the DHT-based channel estimation algorithm.